64 lines
1.9 KiB
JavaScript
64 lines
1.9 KiB
JavaScript
/* eslint max-len: 0 */
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import pull from "lodash/array/pull";
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export default function ({ types: t }) {
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function isProtoKey(node) {
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return t.isLiteral(t.toComputedKey(node, node.key), { value: "__proto__" });
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}
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function isProtoAssignmentExpression(node) {
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let left = node.left;
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return t.isMemberExpression(left) && t.isLiteral(t.toComputedKey(left, left.property), { value: "__proto__" });
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}
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function buildDefaultsCallExpression(expr, ref, file) {
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return t.expressionStatement(t.callExpression(file.addHelper("defaults"), [ref, expr.right]));
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}
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return {
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visitor: {
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AssignmentExpression(path, file) {
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if (!isProtoAssignmentExpression(path.node)) return;
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let nodes = [];
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let left = path.node.left.object;
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let temp = path.scope.maybeGenerateMemoised(left);
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if (temp) nodes.push(t.expressionStatement(t.assignmentExpression("=", temp, left)));
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nodes.push(buildDefaultsCallExpression(path.node, temp || left, file));
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if (temp) nodes.push(temp);
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path.replaceWithMultiple(nodes);
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},
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ExpressionStatement(path, file) {
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let expr = path.node.expression;
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if (!t.isAssignmentExpression(expr, { operator: "=" })) return;
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if (isProtoAssignmentExpression(expr)) {
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path.replaceWith(buildDefaultsCallExpression(expr, expr.left.object, file));
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}
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},
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ObjectExpression(path, file) {
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let proto;
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let { node } = path;
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for (let prop of (node.properties: Array)) {
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if (isProtoKey(prop)) {
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proto = prop.value;
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pull(node.properties, prop);
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}
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}
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if (proto) {
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let args = [t.objectExpression([]), proto];
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if (node.properties.length) args.push(node);
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path.replaceWith(t.callExpression(file.addHelper("extends"), args));
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}
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}
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}
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};
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}
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